Device for preheating air for use in paper-making machines



J.E.ALEXANDER. DEVICE FOR PREHEATING AIR FOR USE IN PAPER MAKING MACHINES. APPLICA ION FILED NOV.26| I91 1,330,155: I Patented Feb. 10,1920. I

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DEVICE FOR PREHEATING AIR FOR USE IN PAPER MAKlNG MACHINES.

APPLICATI V 7. 1,330,155. Patented Feb. 10,l92().

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DEVICE FOR PREHEATING AI R FOR USE IN PAPER MAKING MACHINES. APPLICATION FILED NOV. 26,19i7.

1,330,155. Patente b. 10,1920.

3 S-SHEET 3.

J 115/7 Zf/Zamzmer b a m oni: E. ALEXANDER, or roar EnwAnns, isconsin.

DEVICE r03. rnEHEA'rmG Am son USE IN rArEn-mAx'm's MACHINES.

-Application filed November 26. 1917. Serial No. 204,087

To all whom it may concern:

Be it known that'I, JOHN E. AmxAN'nnR,

a citizen of the United States, and a resident Use in Paper-Makin hereby declare that t 'it enters the ofthe city of Port Edwards, of Wood and State of Wisconsin, havefinvented 'c'ertain new and useful Improvements in Devices for Preheating Air for Machines; and I do e following is a full, clear, and exact reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

This application covers a preheater which; is shown but not claimed in my application for patent for a drier for paper-making machines, filed November 26th, 1917, Serial The invention more, particularly relates to a preheating device for paper-making machines wherein atmospheric. air admitted into the device is heated by means of heat derived fromia main heating unit or drier before said air is permitted to enter said -main heating unit or drier of the paper making machine, wherein the air is further heated for the purpose of drying theweb in the process of paper manufacture.

It is an object of this invention to construct a means for use in a paper-making machine for heating air before it passes into the drying unit of .the machine.

It is also anobject of this invention to provide a device adapted for use in a papermaln'ng machine to heat incoming air before means of heat derived from heaters contained within said drying unit. a

the invention is the A further: object of construction of 'a mechanism -adapted to preheat air by' means vof steam before said air enters the drier unit of a paper-making said steam being derived from machine,

orated from paper under procmoisture eva 'ess of manu acture as the paper is dried by said preheated air which is insaid drying unitp- Another object of the, invention is the construction of an auxiliary air heating defurther heated vice for a paper-making machine wherein air is first heated 1n its passage into a drier unit by means of steam formed in said drier in the county description of the same, v v

chine wherein atmospheric vair drying process ofpaper web'is first heated paper drying drying unit of the machine by or foundation upon which is rigidly mounted or -Rotatably moun e wit. in the casing 2, and

unit during the drying process of a paper web conducted between heating elements in said drier unit which tend to increase the temperature of said preheated air for the evaporation of moisture from said paper web to form device. i I v An important'object of this invention is the construction of a paper making maby means of exhaust heat-derived from the drying unit of the machine.

Other and further important objects of this invention will be apparent from the disclosure in the drawings and specification. The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

Onthe drawings: Figure 1 is a side elevation view of a aux liary heater embodying the principles of this invention.

Fig. 2 isa top plan view thereof.

Fig. 3 is an enlarged section taken on. line tion.

Fig. 4 is a central vertical section taken through the device embodying the principles ofthis invention, showing parts in elevation.

Fig. 5 is a top thereof showing t e walls in section.

Asshown onthe drawings;

'Ther'eference numeral 1, indicates a floor a drier, unit comprising a casing or box 2,

the-steam which is used as the heating medium in the auxiliary heating used in thelan view of the interior machine equipped with an.

' 33, of Fig. 2, with parts shown in elevaprovided with doors or manholes 3, in each end'thereof to afi'ord a means whereby access to the interior mechanisms of the drier unit may be had. Secured in a suitable opening near the top of one end of said- I casing 2, is an air inlet elbow 4, which is connected with one end of an air inlet or feed pipe 5. Mounted securely the exterior of each side of the casing 2, 1n parallel relation to one another are a plurality of vertical bars or bearing members 6, 7, 8 and 9, provided with suitable o enings passages, as clearl shown in ig. 1.

near one end thereof are a plurality of casing 2, near the other'end thereof are a plurality of superimposed transversely arranged cylindrical rollers 11, having the tively,

ends-thereof journaled in the openings of the bearing members 9. The number of rollers '11, is one greater than the number of rollers 10, and said rollers 10 and 11, are disposed opposite one another with the exception of the extra 'roller 11, which is disposed above the lowermostroller 11, and oppositean outlet ipe 12, one end of which projects through t e lower portion of the end wall adjacent'the rollers 10.

Disposed transversely within the casing 2, are two vertical rows of arallel guide rollers 13, superimposed one a ove the other, and having 'the ends thereof journaled in the opening of the bearing members 7 and 8, respectively. Said guide rollers 13 are arran ed intermediate the rollers 10 and 11. ngaged around thelowermost roller 11, is one looped end of an endless feed belt 14,.made of felt or fine wire mesh. Said feed belt 14, engages the lowermost roller 10, and passes over certain of the guide rollers 13, and passes through suitable openings 15, in one of the end walls of the casing 2, out of said. casin and around other rollers not shown, but d1 sposed'below a pulp feeding apron. Engaged around the roller 11, and around the rollers 10 and 11, which are disposed immediately above the lowermost roller 10, and above the roller 11, respec is an endless felt or wire mesh belt 16, which is trained between certain of the guide rollers 13. An endless belt 17, made of felt' or wire mesh is trained around each of the upper pairs of oppositely disposed rollers 10 and 11, and between certain of the guide rollers 13."

Arranged within the casing 2, between the rollers 10, 11 and 13, are a plurality of longitudinally and horizontally positioned heating elements or grids 18. cured within the casing 2, and to the heating elements 18, are a pluralit of horizontal longitudinally disposed ba e plates 19, div'iding the interior of the casing 2, into a pluralit of spaces orcompartments, the ends of whic are open and form a continuous passage within the casing with the aid of a number of horizontal auxiliary'baflie plates 20,- arranged alternately with'respect to one another and secured to the inner surfaces of the end walls of the casing.

Deposited upon the upper surface of the 'feedbelt 14, by suitable machines not shown,

is a pulp or web 21, which is to be dried to formpaper. Said web 21, when the device is in operation, is carried along by the feed Rigidly se-' vice 23. Also connected with the suction pump 23, is a pipe 24, the other end of which connects up w1th one end of a pipe coil, radiator orexhaust heater 25,'disposed within a casing or box 26, of an auxiliary or preheating device which is rigidly mounted upon the foundation 1, adjacent the suction pump 23, and has an opening in the upper end or top of the casing 26, thereof for receiving the other end ofthe feed pipe 5, connected therein The pipe coil 25, is

continuous and may be of any desired form,

the other end thereof connecting up with an exhaust pipe 27, which projects through the casing 26. Said exhaust pipe 27, may be of any desired length in order that the same may exhaust into the atmosphere at a distance sufliciently remote from the papermaking machine. As shown in Figs. 4 and 5, it will be seen that the interior of the ipe coil 25', disposed within the casing 26, o the preheating unit does notcommunicate with the interior of said casing but merely affords a continuous passage through said ing unit for the exhaust from the drler unit.

An air intake or inlet pipe 28, provided with a plurality of valves 29, is connected up with the lower portion of the casing 26, to afford an entrance for atmospheric air. The valves 29, project into one of'the walls of the casing 26, near the lower end-thereof and are adapted to be operated independently of one another to control the flow of air into the preheating unit.

The operation'is as follows:

Pulp to be formed or made into paper is run onto an apron of apaper-makln machine and is deposited upon the feed 14, which maybe made of felt, wire mesh or other suitable vmaterial. The deposited pulp after passing 'throu h parts of the paper-making machine ilot shown) is formed into the web 21, which requires .drying during'the process, in which the web is made into paper. For the purpose of drypass in between the heating elements 18.,

preheat belt ' through the drier unit through the exhaust pi downwardly in a continuous .passa e and out through the outlet pipe 12, tgiereby thoroughly drying theweb not onlyxalong its edges, but evenly all the way through.

The heating elements are. independent of one another and may accordingly" be regulated to obtain graduated-temperatures if so desired. The air which is used as the drying medium in the drier unit is adapted to be heated by said heating elements 18, to

a temperature, sufiicient to draw the moisture out of the web 21,-whichmoisture mixes with the hot air and forms a steam. The suction pump 23, which may,'of course, be operated by any suitable source of power, acts to suck or draw the steam out of the casing 2, through the pipe 12, the pump 23, and the pipe 2 k, and then forcing said steam through the radiator pipes 25, v and out e 27 Thepassage of the exhaust steam t rough the-radiator pipes 25, tends to heat the same thereby causing a preheating of the atmospheric air in the preheating unit before said air passes through the pipe. 5, into the drier unit. The circulation. of the air and exhaust steam and the preheatingunit is performed by the suction pump 23.

. From the above description it will be noted .casing 2, for further that use is made of the exhausted heat units to preheat the atmospheric air entering the paper-making machine before it enters the heating, and that the constant drawing out of the steam formed in the drier unit afiords a ready means for drying the web 21, rapidly and uniformly throughout.

The object of providing a number of air inlet valves 29, in the intake pipe 28, is to afford a means for regulating the flow of air into the casing 26, and also insure an even distribution of the .entering air into said casing 26, to permit the entering air to be evenly preheated by the radiator pipes 25, before said air enters-the casing 2.

'An important feature of the invention is the construction of an air preheating device adapted to be used in combination with. a drier unit. of a paper-making machine, whereby exhausted heatiunits derived from the drier unit are used to heat air before the same enters the drler unit. It will, of

course, be understood that the preheating unit may be made in numerous different ways without departing from the principles of the invention.

drier unit, by means' of exhausted heat units 7 derived from an exhaust steam formed in the drier unit during the drying process of said web.

Numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting thepatent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. An air preheating device for use with a drier for a paper-making machine, said device comprising a casing connected with said drier to' supply preheated air thereto, a curved radiator pipe therein connected with said drier, and valve controlled air intake pipes connected with said casing.

2. An air preheating device for use with a drier for a paper-making machine, said device comprising a casing, an air inlet pipe connecting the same with said drier, suction from said air intake means 7 pipe connected therewith, a'casing attached 'to said inlet pipe, a'heating element in said casing having the ends thereof projecting outwardly therefrom, a suction pump connected with one projecting end of said heating element and also connected with said drier unit, the other projecting end of said heating element serving as an exhaust, and

valved air intake means connected with said casing to admit air into said casing where the same is heated b fore passage into said drier unit by means of the exhaust from said drier unit which is forced through said heating element by said suction pump.

4. An air preheating device of the class described comprising a casing, acurved radiator pi e dlsposed therein, a ump connected with one end of said ra iator pipe for forcing hot air and steam therethrough and out of the other endof said radiator pipe, an air inlet pi e connected with said casing, a plurality 0 independently adjustable valves therein for controlling the sup.- ply of air to said casing, and an outletpipe connected with said to permit the casing escape of the airfrom sald caslng after it has een heated by said radiator pipe.

- 5. The combination with a drier and the heating elements thereof, of an. air preheating device comprising a casing connected with said drier, means connected with the casing initially supplying air at atmospheric temperature to said casing and drier I In testimony whereof I have hereunto.

to be heated by said drier heating elesubscribed my name in the presence of two ments, and means in said casing connected subscribing witnesses.

with the drier to receive the heated exhaust JOHN E. ALEXANDER. 5 air therefrom to preheat the air from said Witnesses:

air supplying means before it enters the EARL M. HARDINE,

drier. j CHARLES W. HILLS, Jr. 

